Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly and a first insulating part, the housing has a wall portion. The electrode assembly is contained in the shell and comprises a main body part and a tab, and the tab is arranged at one end of the main body part in a protruding mode in the thickness direction of the wall part. The first insulating part is contained in the shell and comprises an insulating body and a limiting part, the insulating body is arranged between the wall part and the electrode assembly in the thickness direction of the wall part, the limiting part is connected to the insulating body, at least part of the limiting part is located between the main body part and the shell in the first direction, and the first direction is perpendicular to the thickness direction of the wall part. The limiting part extends to the position between the shell and the main body part in the thickness direction of the wall part, so that the limiting part can limit the main body part in the first direction, the phenomenon that the electrode assembly moves in the first direction can be reduced, and the risk that the electrode assembly collides with the shell is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of performance and safety. The battery cell of the battery is assembled into an electrode assembly (bare cell) by winding or laminating the positive electrode sheet, the negative electrode sheet and the diaphragm, and then loaded into the shell, covered with the end cover, and finally injected with the electrolyte. However, due to the complex use environment of the battery cell, the battery cell in the prior art often has the phenomenon of the electrode assembly moving in the shell during use, which makes the electrode assembly extremely easy to be damaged and easily causes a greater safety hazard in use, thereby resulting in a short service life of the battery cell and poor safety in use. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the service life and safety of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly and a first insulating member; the shell has a wall portion; the electrode assembly is accommodated in the shell, the electrode assembly comprises a main body portion and a pole ear, and along the thickness direction of the wall portion, the pole ear is protruding from one end of the main body portion; the first insulating member is accommodated in the shell, the first insulating member comprises an insulating body and a limiting portion, along the thickness direction of the wall portion, the insulating body is arranged between the wall portion and the electrode assembly to insulate and isolate the wall portion and the electrode assembly, the limiting portion is connected to the insulating body, and along a first direction, at least a portion of the limiting portion is located between the main body portion and the shell, and the first direction is perpendicular to the thickness direction of the wall portion.

[0005] In the above technical solution, the first insulating member arranged in the shell is provided with an insulating body and a limiting portion, and the limiting portion is connected to the insulating body. By arranging the insulating body between the electrode assembly and the wall of the shell along the thickness direction of the wall, the wall and the electrode assembly can be insulated and isolated, so as to achieve insulation between the electrode assembly and the wall, thereby reducing the risk of short circuit in the battery cell. In addition, by extending the limiting portion connected to the insulating body along the thickness direction of the wall to between the shell and the main body of the electrode assembly, at least part of the limiting portion is located between the shell and the main body along the first direction, so that the limiting portion can play a certain limiting role on the main body of the electrode assembly in the first direction, thereby effectively reducing the phenomenon of the electrode assembly moving in the first direction perpendicular to the thickness direction of the wall during use, so as to reduce the risk of collision between the electrode assembly and the shell, thereby alleviating the phenomenon of damage to the electrode assembly or causing greater safety hazards, which is conducive to improving the service life and safety of the battery cell.

[0006] In some embodiments, the shell includes a shell and an end cover; the shell has an opening; the end cover covers the opening, and an electrode terminal is provided on the end cover, and the electrode terminal is electrically connected to the electrode tab; wherein the wall portion is the end cover.

[0007] In the above technical solution, the outer shell is provided with a shell and an end cover, and the wall portion of the outer shell is the end cover, that is, the insulating body of the first insulating member is arranged between the end cover and the electrode assembly, and the limiting portion of the first insulating member can extend along the thickness direction of the end cover to between the shell and the main body of the electrode assembly, so that on the one hand, it can play a role of insulating and isolating the end cover and the electrode assembly to achieve insulation between the electrode assembly and the end cover, and on the other hand, the insulating body can limit the main body of the electrode assembly in the thickness direction of the end cover while also limiting the main body of the electrode assembly in the first direction through the limiting portion, so that the phenomenon of the electrode assembly moving in a direction perpendicular to the thickness direction of the end cover during use can be effectively reduced, thereby alleviating the risk of collision between the electrode assembly and the end cover, and reducing the risk of collision between the electrode assembly and the shell, so as to improve the service life and safety of the battery cell.

[0008] In some embodiments, along the thickness direction of the wall portion, the side of the insulating body facing away from the wall portion has a first abutment surface that at least partially abuts against the main body portion, and the limiting portion extends from the first abutment surface in a direction away from the wall portion to between the main body portion and the outer shell.

[0009] In the above technical solution, the insulating body is provided with a first abutting surface abutting against at least part of the main body on the side away from the wall in the thickness direction of the wall, so that the main body can abut against the insulating body to play a certain limiting role in the thickness direction of the wall, thereby effectively reducing the phenomenon of the electrode assembly moving along the thickness direction of the wall during use, so as to improve the service life and safety of the battery cell. In addition, the limiting portion extends from the first abutting surface to the direction away from the wall to between the main body and the shell, that is, the limiting portion is convexly arranged on the first abutting surface. The first insulating member of this structure is easy to manufacture and helps to reduce the difficulty of manufacturing.

[0010] In some embodiments, the first abutting surface is provided with a receiving groove for receiving the pole lug.

[0011] In the above technical solution, an accommodating groove is provided on the first abutting surface of the insulating body, that is, an accommodating groove is provided on the side of the insulating body facing the main body in the thickness direction of the wall portion, so that the pole ear can be accommodated in the accommodating groove. The first insulating member of this structure facilitates the connection of the pole ear with the electrode terminal arranged on the outer shell, and can play a certain protective role on the pole ear, so as to reduce the risk of the pole ear being squeezed and damaged by the first insulating member.

[0012] In some embodiments, the battery cell has a square structure, and the first direction is a length direction of the wall portion.

[0013] In the above technical solution, the battery cell is arranged as a square structure, and the first direction is the length direction of the wall. That is to say, since the gap between the electrode assembly and the outer shell in the length direction of the wall is relatively large, the electrode assembly can be limited in the first direction by the limiting portion, which can effectively alleviate the movement amplitude of the electrode assembly and provide better protection for the electrode assembly.

[0014] In some embodiments, the first insulating member includes two limiting portions; along the first direction, the two limiting portions are respectively located on both sides of the main body.

[0015] In the above technical solution, two limiting portions are connected to the insulating body, and the two limiting portions are respectively arranged on both sides of the main body of the electrode assembly along the first direction, so that the main body of the electrode assembly is located between the two limiting portions in the first direction, thereby further enhancing the limiting effect of the first insulating member on the electrode assembly to reduce the risk of collision between the electrode assembly and the outer shell.

[0016] In some embodiments, along the first direction, the limiting portion abuts against the main body.

[0017] In the above technical solution, by setting the limiting part and the main body as a structure that abuts against each other, the distance between the main body and the limiting part in the first direction can be effectively reduced, so as to play a better limiting role on the electrode assembly, thereby further alleviating the phenomenon of movement of the electrode assembly during use.

[0018] In some embodiments, along the first direction, the main body has an end surface, the limiting portion has a second abutting surface that fits at least partially with the end surface, and the second abutting surface abuts against the end surface.

[0019] In the above technical solution, the limiting portion has a second abutting surface abutting against the end face of the main body, and the shape of the second abutting surface matches the shape of at least part of the end face of the main body, so that the second abutting surface and at least part of the end face of the main body can fit each other, thereby effectively increasing the contact area between the limiting portion and the main body, alleviating the stress concentration phenomenon between the main body and the limiting portion, and further reducing the risk of local lithium deposition or damage to the electrode assembly during use.

[0020] In some embodiments, the end surface and the second abutting surface are both arc surfaces, and along the first direction, the limiting portion is entirely located between the housing and the end surface.

[0021] In the above technical solution, by setting the second abutment surface of the limiting part and the end surface of the main body as arc surfaces, the contact area between the limiting part and the main body is increased, which is conducive to improving the structural stability between the limiting part and the main body, so as to improve the performance of the battery cell, and the battery cell with such a structure can also play a role in limiting and stabilizing the electrode assembly in the second direction perpendicular to the thickness direction of the wall and the first direction. In addition, by setting the limiting part as a whole between the shell and the end surface, the phenomenon that the limiting part extends between the main body and the shell along the second direction perpendicular to the thickness direction of the wall and the first direction can be alleviated, so as to save the internal space of the battery cell and improve the energy density of the battery cell.

[0022] In some embodiments, the battery cell includes a plurality of the electrode assemblies, and the plurality of the electrode assemblies are stacked along the second direction, and the first direction, the second direction and the thickness direction of the wall portion are perpendicular to each other; the limiting portion has a plurality of the second abutment surfaces arranged along the second direction, and each of the second abutment surfaces abuts against an end face of the main body portion.

[0023] In the above technical solution, the battery cell is provided with a plurality of electrode assemblies arranged along the second direction, and the limiting portion has a plurality of second abutment surfaces arranged along the second direction, so that each second abutment surface can abut against at least part of the end surface of a main body portion, thereby enabling the limiting portion and the main bodies of the plurality of electrode assemblies to fit each other, so as to ensure the contact area between the limiting portion and the main bodies of the plurality of electrode assemblies, thereby effectively reducing the risk of collision between the plurality of electrode assemblies and the outer shell while improving the energy density of the battery cell.

[0024] In some embodiments, along the thickness direction of the wall portion, the length of the portion of the limiting portion extending between the main body portion and the shell is L1, and the length of the main body portion is L2, satisfying that L1≥0.05×L2.

[0025] In the above technical solution, by setting the length of the portion where the limit portion extends along the thickness direction of the wall portion to between the main body portion and the outer shell to be greater than or equal to 5% of the length of the main body portion in the thickness direction of the wall portion, the situation in which the contact area between the limit portion and the main body portion is too small due to the too small length of the limit portion can be alleviated, so as to reduce the stress concentration phenomenon between the limit portion and the main body portion, thereby helping to reduce the risk of local lithium deposition during use of the electrode assembly.

[0026] In some embodiments, along the first direction, the maximum thickness of the limiting portion is D1, satisfying D1≤50 mm.

[0027] In the above technical solution, by setting the maximum thickness of the limiting part in the first direction to be less than or equal to 50 mm, the phenomenon that the limiting part occupies too much space due to the excessive thickness of the limiting part is alleviated, which is beneficial to improving the space utilization of the electrode assembly in the shell to ensure the energy density of the battery cell.

[0028] In some embodiments, along the first direction, the minimum thickness of the limiting portion is D2, satisfying 0.05 mm ≤ D2 ≤ 2 mm.

[0029] In the above technical solution, by setting the minimum thickness of the limiting part in the first direction to 0.05mm to 2mm, on the one hand, the phenomenon of poor structural strength of the limiting part caused by the small thickness of the limiting part can be reduced, so as to reduce the risk of breakage of the limiting part during use; on the other hand, the phenomenon of low space utilization of the electrode assembly in the outer shell caused by the excessive thickness of the limiting part can be alleviated, so as to reduce the influence of the limiting part on the energy density of the battery cell.

[0030] In some embodiments, along the first direction, the minimum distance between the main body and the shell is D3, and the minimum thickness of the limiting portion is D2, satisfying 0.05×D3≤D2≤0.95×D3.

[0031] In the above technical solution, by setting the minimum thickness of the limiting part in the first direction to 5% to 95% of the minimum distance between the main body and the shell in the first direction, that is, the limiting part occupies 5% to 95% of the space of the minimum gap between the main body and the shell in the first direction, on the one hand, the structural strength of the limiting part can be ensured to reduce the risk of the limiting part breaking during use; on the other hand, the phenomenon that the limiting part and the shell rub against each other when the first insulating part is assembled into the shell due to the excessive space occupied by the limiting part can be alleviated, which is beneficial to reduce the difficulty of assembling the battery cell.

[0032] In some embodiments, the battery cell also includes a second insulating member; the second insulating member is wrapped around the outer side of the main body to insulate the main body from the outer shell; wherein, along the first direction, the portion of the limiting portion located between the main body and the outer shell is arranged between the second insulating member and the main body.

[0033] In the above technical solution, the second insulating member is coated on the outer side of the main body so that the second insulating member can play a certain role in insulating and isolating the main body and the shell, thereby achieving insulation between the main body and the shell. In addition, the portion of the limiter extending between the main body and the shell is arranged between the second insulating member and the main body, that is, the second insulating member is coated on the outer side of the limiter, thereby facilitating the improvement of the structural stability between the limiter and the main body, and facilitating the simultaneous assembly of the electrode assembly and the first insulating member into the shell, which is conducive to improving the assembly efficiency of the battery cell.

[0034] In a second aspect, an embodiment of the present application further provides a battery comprising a plurality of the above-mentioned battery cells.

[0035] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0038] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0039] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0040] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0041] Figure 5 A schematic structural diagram of a first insulating member provided in some embodiments of the present application;

[0042] Figure 6 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0043] Figure 7 for Figure 6 A partial enlarged view of the battery cell at A shown;

[0044] Figure 8 A schematic diagram of the connection between the first insulating member and the electrode assembly provided in some embodiments of the present application;

[0045] Fig. 9 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, perpendicular to the thickness direction of the wall;

[0046] Fig.10 A partial cross-sectional view of a battery cell perpendicular to the thickness direction of the wall portion provided in some further embodiments of the present application;

[0047] Fig.11 A schematic diagram of the connection between the first insulating member and the electrode assembly provided in some other embodiments of the present application;

[0048] Fig.12 A partial cross-sectional view of a battery cell perpendicular to the thickness direction of the wall portion provided in some other embodiments of the present application;

[0049] Fig.13 Partial cross-sectional views of battery cells provided in some other embodiments of the present application in a direction perpendicular to the thickness of the wall.

[0050] Icons: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-shell; 211-opening; 22-end cover; 23-electrode assembly; 231-main body; 2311-end face; 232-ear; 24-first insulating member; 241-insulating body; 2411-through hole; 2412-first abutment surface; 2413-accommodating groove; 242-limiting portion; 2421-second abutment surface; 25-electrode terminal; 26-pressure relief mechanism; 27-second insulating member; 200-controller; 300-motor; X-thickness direction of the wall; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0053] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0056] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0057] The term "plurality" used in the present application refers to two or more (including two).

[0058] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0059] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0060] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, and the part of the positive electrode collector that is not coated with the positive electrode active material layer is used as a positive electrode ear to realize the input or output of the positive electrode sheet through the positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, and the part of the negative electrode collector that is not coated with the negative electrode active material layer is used as a negative electrode ear to realize the input or output of the negative electrode sheet through the negative electrode ear. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current is passed without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0061] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0062] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The battery cell is assembled into an electrode assembly (bare cell) by winding or laminating the positive electrode sheet, the negative electrode sheet, and the isolation membrane, which is then loaded into the shell, covered with the end cover, and finally injected with electrolyte. However, with the continuous development of battery technology, higher requirements are also put forward for the service life and safety of battery use. Therefore, the service life and safety of battery cells determine the performance and safety of the battery.

[0063] The inventors found that for a general battery cell, the electrode assembly contained in the shell of the battery cell needs to be connected to the electrode terminal on the end cover to realize the input or output of electrical energy of the battery cell. Therefore, insulation between the electrode assembly and the end cover is required to reduce the risk of short circuit in the battery cell.

[0064] In order to solve the insulation between the electrode assembly and the end cap and reduce the risk of short circuit in the battery cell, in the prior art, a lower plastic is usually set on the side of the end cap facing the electrode assembly to achieve insulation isolation between the electrode assembly and the end cap, and the lower plastic can play a certain limiting role on the electrode assembly to prevent the electrode assembly from moving along the thickness direction of the end cap. However, during the use of the battery cell of this structure, the electrode assembly often moves in a direction perpendicular to the thickness direction of the end cap, that is, moves along the length direction of the end cap, causing the electrode assembly to collide with the shell laterally, which makes the electrode assembly very easy to be damaged and easily causes a greater safety hazard in use, thereby causing the battery cell to have a short service life and poor safety in use.

[0065] Based on the above considerations, in order to solve the problems of short service life and poor safety of battery cells, the inventors have designed a battery cell after in-depth research, including a shell, an electrode assembly and a first insulating member. The shell has a wall portion. The electrode assembly is accommodated in the shell, and the electrode assembly includes a main body and a pole ear. Along the thickness direction of the wall portion, the pole ear is protruding at one end of the main body. The first insulating member is accommodated in the shell, and the first insulating member includes an insulating body and a limiting portion that are interconnected. The insulating body is arranged between the wall portion and the electrode assembly along the thickness direction of the wall portion to insulate and isolate the wall portion and the electrode assembly. Along the first direction, the limiting portion is located on one side of the main body, and at least a portion of the limiting portion extends along the thickness direction of the wall portion to between the main body and the shell, and the first direction is perpendicular to the thickness direction of the wall portion.

[0066] In a battery cell of this structure, the first insulating member disposed in the shell is provided with an insulating body and a limiting portion, and the limiting portion is connected to the insulating body. By disposing the insulating body between the electrode assembly and the wall of the shell along the thickness direction of the wall, the wall and the electrode assembly can be insulated and isolated, so as to achieve insulation between the electrode assembly and the wall, thereby reducing the risk of short circuit in the battery cell. In addition, by extending the limiting portion connected to the insulating body along the thickness direction of the wall to between the shell and the main body of the electrode assembly, at least part of the limiting portion is located between the shell and the main body along the first direction, so that the limiting portion can play a certain limiting role on the main body of the electrode assembly in the first direction, thereby effectively reducing the phenomenon of the electrode assembly moving in the first direction perpendicular to the thickness direction of the wall during use, thereby reducing the risk of collision between the electrode assembly and the shell, thereby alleviating the phenomenon of the electrode assembly being damaged or causing greater safety hazards, which is conducive to improving the service life and safety of the battery cell.

[0067] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, so that the risk of collision between the electrode assembly and the housing during use can be effectively reduced, thereby increasing the service life and safety of the battery cells.

[0068] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0069] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0070] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0071] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0072] Please refer to Figure 2 and Figure 3 , Figure 2 The structure explosion diagram of the battery 100 provided in some embodiments of the present application is shown in FIG. Figure 3A schematic diagram of the structure of a battery cell 20 provided in some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0073] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0074] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes. Figure 2 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0075] In some embodiments, the battery cell 20 may include a housing 21 , an end cap 22 , and an electrode assembly 23 . The end cap 22 is covered on the housing 21 , so that the housing 21 and the end cap 22 together define an outer shell for accommodating the electrode assembly 23 .

[0076] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 , Figure 5 and Figure 6 , Figure 4This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 This is a schematic diagram of the structure of the first insulating member 24 provided in some embodiments of the present application. Figure 6 A cross-sectional view of a battery cell 20 provided for some embodiments of the present application. The present application provides a battery cell 20, which includes a shell, an electrode assembly 23 and a first insulating member 24. The shell has a wall portion. The electrode assembly 23 is accommodated in the shell, and the electrode assembly 23 includes a main body 231 and a pole ear 232. Along the thickness direction X of the wall portion, the pole ear 232 is protruding at one end of the main body 231. The first insulating member 24 is accommodated in the shell, and the first insulating member 24 includes an insulating body 241 and a limiting portion 242. Along the thickness direction X of the wall portion, the insulating body 241 is arranged between the wall portion and the electrode assembly 23 to insulate and isolate the wall portion and the electrode assembly 23. The limiting portion 242 is connected to the insulating body 241. Along the first direction Y, at least a portion of the limiting portion 242 is located between the main body 231 and the shell, and the first direction Y is perpendicular to the thickness direction X of the wall portion.

[0077] The shell plays the role of accommodating the electrode assembly 23. Of course, the shell can also be used to accommodate electrolytes, such as electrolytes. The shell may include a shell 21 and an end cap 22. The shell 21 is a hollow structure with an opening 211 on one side. The end cap 22 covers the opening 211 of the shell 21 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte. The wall of the shell may be the shell 21 or the end cap 22.

[0078] The insulating body 241 is disposed between the wall and the electrode assembly 23 to insulate and isolate the wall and the electrode assembly 23, that is, the insulating body 241 is used to separate the wall and the electrode assembly 23 so that no electrical connection is formed between the wall and the electrode assembly 23. Optionally, the wall may be the end cap 22, or the side wall or bottom wall of the housing 21. Figure 6 In the embodiment, the wall portion is the end cap 22, that is, the insulating body 241 of the first insulating member 24 is disposed between the end cap 22 and the electrode assembly 23 along the thickness direction X of the wall portion. When the wall portion is the bottom wall of the shell 21, that is, the insulating body 241 of the first insulating member 24 is disposed between the bottom wall of the shell 21 and the electrode assembly 23 along the thickness direction X of the wall portion, that is, along the thickness direction X of the wall portion, the insulating body 241 of the first insulating member 24 is disposed on the side of the electrode assembly 23 away from the end cap 22.

[0079] For example, in Figure 6In the embodiment, the battery cell 20 is a rectangular parallelepiped structure, the thickness direction X of the wall portion is the thickness direction of the end cap 22, and is also the height direction of the battery cell 20, and the first direction Y is the length direction of the battery cell 20, and is also the length direction of the end cap 22. Of course, in other embodiments, the battery cell 20 may also be a cylindrical structure, and the first direction Y is the radial direction of the battery cell 20.

[0080] At least part of the limiting portion 242 is located between the main body 231 and the outer shell, that is, the limiting portion 242 is located on one side of the main body 231 of the electrode assembly 23 in the first direction Y, and along the thickness direction X of the wall, at least part of the limiting portion 242 extends to between the main body 231 and the outer shell, wherein along the thickness direction X of the wall, the limiting portion 242 may be partially extended to between the main body 231 and the outer shell, or may be fully extended to between the main body 231 and the outer shell.

[0081] It should be noted that the electrode assembly 23 is a component in the battery cell 20 where an electrochemical reaction occurs. The electrode assembly 23 may include a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly 23 may be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet. Figure 4 In the embodiment of the present application, the electrode assembly 23 is a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet. In the embodiment of the present application, the electrode assembly 23 contained in the housing 21 can be one or more. Figure 4 In the embodiment, there is one electrode assembly 23.

[0082] By arranging the insulating body 241 between the electrode assembly 23 and the wall of the shell along the thickness direction X of the wall, the wall and the electrode assembly 23 can be insulated and isolated, so as to achieve insulation between the electrode assembly 23 and the wall, thereby reducing the risk of short circuit in the battery cell 20. In addition, by extending the limiting portion 242 connected to the insulating body 241 along the thickness direction X of the wall to between the shell and the main body 231 of the electrode assembly 23, at least part of the limiting portion 242 is located between the shell and the main body 231 along the first direction Y, so that the limiting portion 242 can limit the main body 231 of the electrode assembly 23 in the first direction Y, thereby effectively reducing the phenomenon of the electrode assembly 23 moving along the first direction Y during use, thereby reducing the risk of collision between the electrode assembly 23 and the shell, thereby alleviating the phenomenon of the electrode assembly 23 being damaged or causing greater safety hazards, which is conducive to improving the service life and use safety of the battery cell 20.

[0083] In some embodiments, see Figure 3 , Figure 4 and Figure 6 As shown, the housing includes a shell 21 and an end cover 22 . The shell 21 has an opening 211 . The end cover 22 covers the opening 211 . An electrode terminal 25 is disposed on the end cover 22 . The electrode terminal 25 is electrically connected to the pole ear 232 . The wall portion is the end cover 22 .

[0084] Among them, the wall portion is the end cover 22, that is, the thickness direction X of the wall portion is the thickness direction of the end cover, that is to say, the insulating body 241 of the first insulating member 24 is arranged between the end cover 22 and the electrode assembly 23 along the thickness direction X of the wall portion, and the limiting portion 242 extends along the thickness direction X of the wall portion to between the shell 21 and the main body 231 of the electrode assembly 23, so that at least part of the limiting portion 242 is located between the main body 231 and the shell 21 in the first direction Y.

[0085] Optionally, the housing 21 may be of various structural forms. The housing 21 and the end cover 22 may also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, and the like.

[0086] When assembling the battery cell 20, the electrode assembly 23 can be placed in the housing 21 first, and the electrolyte can be filled into the housing 21, and then the end cap 22 can be covered on the opening 211 of the housing 21 to form a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte. Exemplarily, the end cap 22 is welded to the housing 21.

[0087] The shell 21 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 21 can be determined according to the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is a cylindrical structure, a cylindrical structure can be selected; if the electrode assembly 23 is a cuboid structure, a cuboid structure can be selected. Figure 4 In the embodiment, the electrode assembly 23 is a rectangular parallelepiped structure, and the housing 21 is a rectangular parallelepiped structure. Of course, the end cap 22 can also be a variety of structures, for example, the end cap 22 is a plate-like structure or a hollow structure with one end open. Figure 4 In the embodiment, the shell 21 is a rectangular parallelepiped structure, the end cover 22 is a rectangular parallelepiped plate structure, and the end cover 22 covers the opening 211 of the shell 21 .

[0088] In some embodiments, the battery cell 20 is provided with two electrode terminals 25, see Figure 3 and Figure 4As shown, the two electrode terminals 25 are respectively a positive electrode terminal and a negative electrode terminal, and both the positive electrode terminal and the negative electrode terminal are insulated and installed on the end cap 22, that is, the positive electrode terminal and the negative electrode terminal are not electrically connected to the end cap 22. Among them, the electrode assembly 23 has two tabs 232 (i.e., a positive tab and a negative tab), and the two tabs 232 can be located at the same end of the main body 231 in the thickness direction X of the wall, or can be located at the two ends of the main body 231 in the thickness direction X of the wall. For example, in Figure 4 In the embodiment, the two tabs 232 are both protruding from one end of the main body 231 in the wall thickness direction X close to the end cap 22. The positive electrode terminal and the negative electrode terminal are respectively used to connect to the positive tab and the negative tab of the electrode assembly 23 to serve as the positive output electrode and the negative output electrode of the battery cell 20.

[0089] Optionally, the battery cell 20 may further include a pressure relief mechanism 26, which is mounted on the end cover 22. The pressure relief mechanism 26 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0090] For example, Figure 3 and Figure 4 As shown, two electrode terminals 25 (i.e., a positive electrode terminal and a negative electrode terminal) are spaced apart along the length direction (i.e., the first direction Y) of the end cap 22, and the pressure relief mechanism 26 is located between the two electrode terminals 25. The pressure relief mechanism 26 can be a component such as an explosion-proof valve, an explosion-proof disk, a gas valve, a pressure relief valve, or a safety valve.

[0091] Among them, see Figure 5 and Figure 6 The insulating body 241 is provided with two through holes 2411, which are arranged at intervals along the length direction (i.e., the first direction Y) of the end cap 22, and the through holes 2411 penetrate both sides of the insulating body 241 along the thickness direction X of the wall. Each through hole 2411 is used for an electrode terminal 25 to pass through, so that the electrode terminal 25 can be connected to the corresponding electrode tab 232.

[0092] It is understandable that the battery cell 20 is not limited to the above structure, and the battery cell 20 may also be other structures. For example, the battery cell 20 includes a shell 21 and two end caps 22. The shell 21 is a hollow structure with two opposite openings 211 at both ends. One end cap 22 is correspondingly covered at one opening 211 of the shell 21 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte. In this structure, the two electrode terminals 25 (i.e., the positive electrode terminal and the negative electrode terminal) can be installed on the same end cap 22, or on different end caps 22. When the two electrode terminals 25 are installed on different end caps 22, the two pole ears 232 of the electrode assembly 23 are respectively located at the two ends of the electrode assembly 23 in the thickness direction X of the wall. Similarly, the pressure relief mechanism 26 can be installed on one end cap 22, or on both end caps 22.

[0093] The shell is provided with a shell 21 and an end cover 22, and the wall of the shell is the end cover 22, that is, the insulating body 241 of the first insulating member 24 is arranged between the end cover 22 and the electrode assembly 23, and the limiting portion 242 of the first insulating member 24 can extend along the thickness direction of the end cover 22 to between the shell 21 and the main body 231 of the electrode assembly 23, so that on the one hand, the end cover 22 and the electrode assembly 23 can be insulated and isolated to achieve insulation between the electrode assembly 23 and the end cover 22, and on the other hand, the insulating body 241 can be used to insulate the electrode assembly 23. The main body 231 of the battery 20 can limit the main body 231 of the electrode assembly 23 in the first direction Y through the limiting portion 242, thereby effectively reducing the movement of the electrode assembly 23 in a direction perpendicular to the thickness direction of the end cap 22 during use, thereby alleviating the risk of collision between the electrode assembly 23 and the end cap 22, and reducing the risk of collision between the electrode assembly 23 and the shell 21, so as to improve the service life and safety of the battery cell 20.

[0094] According to some embodiments of the present application, referring to Figure 5 and Figure 6 , and please refer to Figure 7 , Figure 7 for Figure 6 The battery cell 20 is shown in a partially enlarged view at A. Along the thickness direction X of the wall, the insulating body 241 has a first abutting surface 2412 on the side away from the wall that abuts against at least part of the main body 231, and the limiting portion 242 extends from the first abutting surface 2412 to the direction away from the wall to between the main body 231 and the shell.

[0095] Among them, the first abutment surface 2412 is a side of the insulating body 241 facing the main body 231 in the thickness direction X of the wall for at least a portion of the main body 231 to abut against. That is to say, after the battery cell 20 is assembled, one end of the main body 231 close to the insulating body 241 in the thickness direction X of the wall abuts against the first abutment surface 2412 of the insulating body 241. One end of the main body 231 in the thickness direction X of the wall can be in full abutment against the first abutment surface 2412, or can be partially abutted against the first abutment surface 2412. For example, in Figure 6 and Figure 7 In the embodiment, a portion of one end of the main body 231 in the thickness direction X of the wall abuts against the first abutting surface 2412 .

[0096] The limiting portion 242 extends from the first abutting surface 2412 in a direction away from the wall portion to between the main body 231 and the outer shell, that is, the limiting portion 242 extends from the first abutting surface 2412 in a direction away from the end cover 22 to between the main body 231 and the shell 21, that is, the limiting portion 242 is protruded on the first abutting surface 2412 of the insulating body 241, and extends along the thickness direction X of the wall portion to between the main body 231 and the shell 21 of the outer shell.

[0097] Of course, the structure of the first insulating member 24 is not limited to this. In other embodiments, the limiting portion 242 may not be arranged on the first abutting surface 2412 of the insulating body 241. The limiting portion 242 may be connected to one end of the insulating body 241 in the first direction Y and extend along the thickness direction X of the wall to between the main body 231 and the shell 21 of the outer shell.

[0098] The insulating body 241 is formed with a first abutting surface 2412 abutting against the main body 231 on the side away from the end cover 22 in the thickness direction X of the wall, so that the main body 231 can abut against the insulating body 241, so as to play a certain limiting role on the main body 231 in the thickness direction X of the wall, thereby effectively reducing the phenomenon of the electrode assembly 23 moving along the thickness direction X of the wall during use, so as to improve the service life and safety of the battery cell 20. In addition, the limiting portion 242 extends from the first abutting surface 2412 in the direction away from the end cover 22 to between the main body 231 and the shell 21 of the outer shell, that is, the limiting portion 242 is convexly arranged on the first abutting surface 2412. The first insulating member 24 of this structure is easy to manufacture and helps to reduce the difficulty of manufacturing.

[0099] According to some embodiments of this application, please continue to refer to Figure 5 , Figure 6 and Figure 7 As shown, the first abutting surface 2412 is provided with a receiving groove 2413 for receiving the pole ear 232 .

[0100] The two tabs 232 of the electrode assembly 23 are both located at one end of the main body 231 facing the end cover 22 in the thickness direction X of the wall, so that the two tabs 232 can be accommodated in the accommodation groove 2413 opened on the first insulator.

[0101] In some embodiments, two through holes 2411 for two electrode terminals 25 to pass through are both arranged on the bottom wall of the receiving groove 2413 , so that the tabs 232 can be easily connected to the corresponding electrode terminals 25 after being received in the receiving groove 2413 .

[0102] By opening a receiving groove 2413 on the first abutting surface 2412 of the insulating body 241, that is, the insulating body 241 is provided with a receiving groove 2413 on the side facing the main body 231 in the thickness direction X of the wall, so that the pole ear 232 can be accommodated in the receiving groove 2413. The first insulating member 24 with this structure facilitates the connection between the pole ear 232 and the electrode terminal 25 arranged on the end cover 22 of the outer shell, and can play a certain protective role on the pole ear 232, so as to reduce the risk of the pole ear 232 being squeezed and damaged by the first insulating member 24.

[0103] According to some embodiments of the present application, see Figure 4 , Figure 5 and Figure 6 As shown, the battery cell 20 is a square structure, and the first direction Y is the length direction of the wall.

[0104] The battery cell 20 is a rectangular parallelepiped, and the first direction Y is the length direction of the wall portion, the length direction of the end cover 22 , and the length direction of the battery cell 20 .

[0105] It should be noted that, in some embodiments, the battery cell 20 can also be other structures. For example, the battery cell 20 is a cylindrical structure, and the first direction Y is the radial direction of the battery cell 20. When the battery cell 20 is a cylindrical structure, the limiting portion 242 can be a structure extending along the circumference of the battery cell 20, that is, the limiting portion 242 surrounds the outer side of the main body 231 of the electrode assembly 23 along the circumference of the battery cell 20.

[0106] By setting the battery cell 20 to a square structure, and the first direction Y being the length direction of the wall portion (the length direction of the end cover 22), that is, since the gap between the electrode assembly 23 and the shell 21 of the outer shell in the length direction of the end cover 22 is relatively large, the electrode assembly 23 can be limited in the first direction Y by the limiting portion 242, which can effectively alleviate the movement amplitude of the electrode assembly 23, thereby providing better protection for the electrode assembly 23.

[0107] According to some embodiments of the present application, see Figure 4 , Figure 5 and Figure 6 As shown, the first insulating member 24 includes two limiting portions 242 . Along the first direction Y, the two limiting portions 242 are respectively located on two sides of the main body 231 .

[0108] In the above description, the first insulating member 24 includes two limiting portions 242, that is, two limiting portions 242 are connected to the insulating body 241, and the two limiting portions 242 are respectively arranged on both sides of the main body 231 in the first direction Y, that is, the main body 231 is arranged between the two limiting portions 242 in the first direction Y.

[0109] By connecting two limiting portions 242 on the insulating body 241, and the two limiting portions 242 are respectively arranged on both sides of the main body 231 of the electrode assembly 23 along the first direction Y, the main body 231 of the electrode assembly 23 is located between the two limiting portions 242 in the first direction Y, thereby further enhancing the limiting effect of the first insulating member 24 on the electrode assembly 23, thereby reducing the risk of collision between the electrode assembly 23 and the shell 21 of the outer shell.

[0110] According to some embodiments of the present application, referring to Figure 6 and Figure 7 , and please refer to Figure 8 , Figure 8 The diagram is a schematic diagram of the connection between the first insulating member 24 and the electrode assembly 23 provided in some embodiments of the present application. Along the first direction Y, the limiting portion 242 abuts against the main body 231 .

[0111] Among them, the limiting portion 242 abuts against the main body 231, that is, the limiting portion 242 abuts against the main body 231 of the electrode assembly 23 in the first direction Y. Similarly, in an embodiment in which the first insulating member 24 has two limiting portions 242, the two limiting portions 242 are respectively located on both sides of the main body 231 along the first direction Y, and respectively abut against the two ends of the main body 231.

[0112] By configuring the limiting portion 242 and the main body 231 to be structures that abut against each other, the distance between the main body 231 and the limiting portion 242 in the first direction Y can be effectively reduced, so as to provide a better limiting effect on the electrode assembly 23, thereby further alleviating the phenomenon of movement of the electrode assembly 23 during use.

[0113] According to some embodiments of the present application, referring to Figure 8 , and please refer to Fig. 9 , Fig. 9A partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application perpendicular to the thickness direction X of the wall. Along the first direction Y, the main body 231 has an end surface 2311, and the limiting portion 242 has a second abutting surface 2421 that fits at least partially with the end surface 2311, and the second abutting surface 2421 abuts against the end surface 2311.

[0114] Among them, in the first direction Y, the second abutment surface 2421 of the limiting portion 242 and at least a portion of the end surface 2311 of the main body 231 fit each other, that is, the shape of the second abutment surface 2421 of the limiting portion 242 is the same as the shape of at least a portion of the end surface 2311 of the main body 231, and the second abutment surface 2421 of the limiting portion 242 fits each other with the corresponding end surface 2311 of the main body 231. It should be noted that the second abutment surface 2421 can be a structure that fits each other as a whole with the end surface 2311 of the main body 231, that is, the second abutment surface 2421 and the end surface 2311 of the main body 231 are completely fit. Of course, the second abutment surface 2421 can also be a structure that fits each other with part of the end surface 2311 of the main body 231. For example, in Fig. 9 In the embodiment, the second abutting surface 2421 and a portion of the end surface 2311 of the main body 231 are in contact with each other.

[0115] Optionally, in Fig. 9 In the embodiment, the end face 2311 and the second abutting face 2421 are both arc faces, and along the first direction Y, the limiting portion 242 is located as a whole between the shell 21 of the shell and the end face 2311, that is, the end face 2311 and the second abutting face 2421 are arc faces of the same shape, and the limiting portion 242 is completely accommodated in the space defined by the shell 21 of the shell and the end face 2311 of the main body 231 in the first direction Y. By setting the second abutting face 2421 of the limiting portion 242 and the end face 2311 of the main body 231 as arc faces, the contact area between the limiting portion 242 and the main body 231 is increased, and the structural stability between the limiting portion 242 and the main body 231 is improved, so as to improve the performance of the battery cell 20, and the battery cell 20 with such a structure can also limit and stabilize the electrode assembly 23 in the second direction Z perpendicular to the thickness direction X of the wall and the first direction Y. In addition, by setting the limiting portion 242 as a whole between the shell 21 of the outer shell and the end face 2311, the phenomenon that the limiting portion 242 extends to between the main body 231 and the shell 21 of the outer shell along the second direction Z perpendicular to the thickness direction X of the wall and the first direction Y can be alleviated, which is beneficial to saving the internal space of the battery cell 20 and improving the energy density of the battery cell 20.

[0116] It should be noted that, in some embodiments, referring to Fig.10 , Fig.10In a partial cross-sectional view of a battery cell 20 perpendicular to the thickness direction X of the wall provided in some other embodiments of the present application, the second abutment surface 2421 of the limiting portion 242 may also be configured as a non-matching structure with the end surface 2311 of the main body 231, and at least a portion of the second abutment surface 2421 of the limiting portion 242 is abutted against the end surface 2311 of the main body 231, for example, Fig.10 In the embodiment, the limiting portion 242 is a flat plate structure, and the side of the limiting portion 242 facing the main body 231 in the first direction Y abuts against the end surface 2311 of the main body 231 .

[0117] The limiting portion 242 has a second abutting surface 2421 abutting against the end surface 2311 of the main body 231, and the shape of the second abutting surface 2421 is matched with the shape of at least part of the end surface 2311 of the main body 231, so that the second abutting surface 2421 and at least part of the end surface 2311 of the main body 231 can fit each other, thereby effectively increasing the contact area between the limiting portion 242 and the main body 231, so as to alleviate the stress concentration phenomenon between the main body 231 and the limiting portion 242, and further reduce the risk of local lithium deposition or damage of the electrode assembly 23 during use.

[0118] In some embodiments, the electrode assembly 23 contained in the housing 21 may be one or more. For example, Fig. 9 In the embodiment, there is only one electrode assembly 23 contained in the housing 21, so that the limiting portion 242 has only one second abutting surface 2421 formed on one side facing the main body 231 in the first direction Y, which is in mutual fit with at least a part of the end surface 2311 of the main body 231. Of course, there may be multiple electrode assemblies 23 contained in the housing 21, as shown in FIG. Fig.11 and Fig.12 , Fig.11 This is a schematic diagram of the connection between the first insulating member 24 and the electrode assembly 23 provided in some other embodiments of the present application. Fig.12 A partial cross-sectional view of a battery cell 20 perpendicular to the thickness direction X of the wall provided in some other embodiments of the present application. The battery cell 20 includes a plurality of electrode assemblies 23, and the plurality of electrode assemblies 23 are stacked along the second direction Z, and the first direction Y, the second direction Z, and the thickness direction X of the wall are perpendicular to each other. The limiting portion 242 has a plurality of second abutting surfaces 2421 arranged along the second direction Z, and each second abutting surface 2421 abuts against an end surface 2311 of a main body 231.

[0119] Among them, the second direction Z is the stacking direction of the multiple electrode assemblies 23, and is also the thickness direction of the electrode assemblies 23. The limiting portion 242 has a plurality of second abutment surfaces 2421 arranged along the second direction Z, that is, the limiting portion 242 is formed with a plurality of second abutment surfaces 2421 arranged along the second direction Z on the side facing the main body 231 in the first direction Y. In other words, the limiting portion 242 has a plurality of second abutment surfaces 2421 that are the same as the stacking direction of the electrode assemblies 23, and the end face 2311 of the main body 231 of each electrode assembly 23 is attached to the corresponding second abutment surface 2421.

[0120] For example, in Fig.11 and Fig.12 In the embodiment, there are two electrode assemblies 23, which are stacked, and the end faces 2311 of the two electrode assemblies 23 are both arc surfaces. The limiting portion 242 has two second abutting surfaces 2421 arranged along the second direction Z, and each second abutting surface 2421 abuts against the end face 2311 of a main body portion 231.

[0121] It should be noted that, in other embodiments, referring to Fig.13 , Fig.13 In the partial cross-sectional view of the battery cell 20 perpendicular to the thickness direction X of the wall provided in some other embodiments of the present application, the limiting portion 242 may also be provided with only one arc-shaped second abutment surface 2421, the end surfaces 2311 of the main bodies 231 of the plurality of electrode assemblies 23 all abut against one second abutment surface 2421, and the second abutment surface 2421 and at least part of the end surface 2311 of the main body 231 of each electrode assembly 23 fit each other. The limiting portion 242 with such a structure can increase the contact area between the second abutment surface 2421 and the main body 231 of the electrode assembly 23 while reducing the manufacturing difficulty of the limiting portion 242, and can effectively reduce the assembly difficulty between the limiting portion 242 and the electrode assembly 23.

[0122] The battery cell 20 is provided with a plurality of electrode assemblies 23 arranged along the second direction Z, and the limiting portion 242 has a plurality of second abutment surfaces 2421 arranged along the second direction Z, so that each second abutment surface 2421 can abut against at least part of the end surface 2311 of a main body 231, thereby enabling the limiting portion 242 and the main bodies 231 of the plurality of electrode assemblies 23 to fit each other, so as to ensure the contact area between the limiting portion 242 and the main bodies 231 of the plurality of electrode assemblies 23, thereby effectively reducing the risk of collision between the plurality of electrode assemblies 23 and the outer shell shell 21 while improving the energy density of the battery cell 20.

[0123] According to some embodiments of the present application, see Figure 6 and Figure 7As shown, along the thickness direction X of the wall, the length of the portion of the limiting portion 242 extending between the main body 231 and the shell 21 of the housing is L1, and the length of the main body 231 is L2, satisfying that L1≥0.05×L2.

[0124] Among them, the limiting portion 242 extends to the part between the main body 231 and the shell 21 of the outer shell, that is, the limiting portion 242 can be used for the main body 231 of the electrode assembly 23 to abut against the part, that is, L1 is the length of the part where the limiting portion 242 abuts against the main body 231 of the electrode assembly 23 in the thickness direction X of the wall.

[0125] It should be noted that the length of the portion of the limiting portion 242 extending between the main body 231 and the shell 21 of the outer shell may be greater than the length of the main body 231, that is, along the thickness direction X of the wall, the limiting portion 242 extends from one end of the main body 231 close to the end cover 22 to between the main body 231 and the shell 21 of the outer shell, and extends out of the end of the main body 231 away from the end cover 22, so that the main body 231 can be completely against the limiting portion 242.

[0126] By setting the length of the portion where the limit portion 242 extends along the thickness direction X of the wall to between the main body 231 and the shell 21 of the outer shell to be greater than or equal to 5% of the length of the main body 231 in the thickness direction X of the wall, the situation where the contact area between the limit portion 242 and the main body 231 is too small due to the length of the limit portion 242 being too small can be alleviated, thereby reducing the stress concentration phenomenon between the limit portion 242 and the main body 231, which is beneficial to reducing the risk of local lithium deposition of the electrode assembly 23 during use.

[0127] According to some embodiments of the present application, see Fig. 9 As shown, along the first direction Y, the maximum thickness of the limiting portion 242 is D1, satisfying D1≤50 mm.

[0128] The maximum thickness of the limiting portion 242 in the first direction Y is the maximum size occupied by the limiting portion 242 in the first direction Y. Fig. 9 In the figure, since the second abutment surface 2421 of the limiting portion 242 and the end surface 2311 of the main body 231 are both arc-shaped, a second abutment surface 2421 with an arc-shaped structure is formed on the side of the limiting portion 242 facing the main body 231 in the first direction Y, that is, the maximum thickness of the limiting portion 242 in the first direction Y is the maximum distance between the two sides of the limiting portion 242 in the first direction Y.

[0129] By setting the maximum thickness of the limit portion 242 in the first direction Y to be less than or equal to 50 mm, the phenomenon that the limit portion 242 occupies too much space due to its excessive thickness can be alleviated, which is beneficial to improving the space utilization of the electrode assembly 23 in the shell 21 of the outer shell, so as to ensure the energy density of the battery cell 20.

[0130] According to some embodiments of this application, see Fig. 9 As shown, along the first direction Y, the minimum thickness of the limiting portion 242 is D2, which satisfies 0.05 mm ≤ D2 ≤ 2 mm.

[0131] The minimum thickness of the limiting portion 242 in the first direction Y is the thickness of the weakest region of the limiting portion 242 in the first direction Y. Fig. 9 In the embodiment, since the second abutting surface 2421 of the limiting portion 242 is an arc surface, the limiting portion 242 forms a structure with one side being an arc, and the minimum thickness of the limiting portion 242 in the first direction Y is the minimum distance between the first abutting surface 2412 and the side of the limiting portion 242 away from the first abutting surface 2412 in the first direction Y, that is, the main body 231 and the shell 21 of the outer shell form a minimum gap with the minimum width in the first direction Y, and the minimum thickness of the limiting portion 242 in the first direction Y is the thickness of the portion of the limiting portion 242 located in the minimum gap formed between the main body 231 and the shell 21 of the outer shell in the first direction Y. Of course, in some embodiments, if the limiting portion 242 is a regular rectangular parallelepiped structure, the minimum thickness of the limiting portion 242 in the first direction Y is the thickness of the limiting portion 242 in the first direction Y.

[0132] By setting the minimum thickness of the limit portion 242 in the first direction Y to 0.05 mm to 2 mm, on the one hand, the phenomenon of poor structural strength of the limit portion 242 caused by the limit portion 242 being too thin can be reduced, thereby reducing the risk of the limit portion 242 breaking during use. On the other hand, the phenomenon of low space utilization of the electrode assembly 23 in the shell 21 of the outer shell caused by the limit portion 242 being too thick can be alleviated, thereby reducing the influence of the limit portion 242 on the energy density of the battery cell 20.

[0133] According to some embodiments of this application, please continue to refer to Fig. 9 As shown, along the first direction Y, the minimum distance between the main body 231 and the housing is D3, and the minimum thickness of the limiting portion 242 is D2, satisfying 0.05×D3≤D2≤0.95×D3.

[0134] The minimum distance between the main body 231 and the housing in the first direction Y is the width of the minimum gap formed between the main body 231 and the housing 21 of the housing along the first direction Y. Fig. 9 In the figure, since the end face 2311 of the main body 231 is an arc surface, the main body 231 forms a structure with one end being an arc, and the minimum distance between the main body 231 and the shell 21 of the outer shell in the first direction Y is the distance between the farthest end of the main body 231 in the first direction Y and the shell 21 of the outer shell.

[0135] Along the first direction Y, the minimum thickness of the limiting portion 242 occupies 5% to 95% of the minimum distance between the main body 231 and the shell 21 of the shell. Since the first abutting surface 2412 of the limiting portion 242 and the end surface 2311 of the main body 231 are both arc surfaces that fit each other, the area where the minimum thickness of the limiting portion 242 in the first direction Y is located is the portion of the limiting portion 242 located in the minimum gap formed between the main body 231 and the inner side wall of the shell 21 of the shell in the first direction Y, that is, the thickness of the limiting portion 242 located in the minimum gap between the main body 231 and the shell 21 of the shell in the first direction Y is 5% to 95% of the width of the minimum gap. Of course, in other embodiments, if the limiting portion 242 is a regular rectangular parallelepiped structure, that is, the limiting portion 242 is located as a whole in the minimum gap between the main body 231 and the shell 21 of the shell in the first direction Y, that is, the thickness of the limiting portion 242 is 5% to 95% of the width of the minimum gap.

[0136] By setting the minimum thickness of the limiting portion 242 in the first direction Y to 5% to 95% of the minimum distance between the main body 231 and the shell 21 of the outer shell in the first direction Y, that is, the limiting portion 242 occupies 5% to 95% of the space of the minimum gap between the main body 231 and the shell 21 of the outer shell in the first direction Y, on the one hand, the structural strength of the limiting portion 242 can be ensured to reduce the risk of the limiting portion 242 breaking during use; on the other hand, the phenomenon that the limiting portion 242 and the shell 21 of the outer shell 24 rub against each other when the first insulating member 24 is assembled into the outer shell due to the excessive space occupied by the limiting portion 242 can be alleviated, which is beneficial to reduce the difficulty of assembling the battery cell 20.

[0137] According to some embodiments of the present application, see Figure 4 , Figure 6 and Figure 7 As shown, the battery cell 20 further includes a second insulating member 27. The second insulating member 27 is coated on the outer side of the main body 231 to insulate the main body 231 from the shell, wherein along the first direction Y, the portion of the limiting portion 242 between the main body 231 and the shell is disposed between the second insulating member 27 and the main body 231.

[0138] Among them, the part of the limiting portion 242 located between the main body 231 and the outer shell is arranged between the second insulating member 27 and the main body 231, that is, the second insulating member 27 is covered on the outer side of the part of the limiting portion 242 that is against the main body 231, so that the part of the limiting portion 242 located between the main body 231 and the outer shell is located between the second insulating member 27 and the main body 231.

[0139] Exemplarily, the second insulating member 27 is an insulating film, which is coated on the outside of the main body 231 to insulate the main body 231 from the housing. The second insulating member 27 can be made of various materials, such as rubber, plastic or the like.

[0140] During the assembly of the battery cell 20 , the first insulating member 24 and the electrode assembly 23 may be connected to each other first, and then the second insulating member 27 may be wrapped around the outside of the main body 231 and the limiting portion 242 , and then the electrode assembly 23 may be placed in the shell 21 of the outer shell.

[0141] By covering the second insulating member 27 on the outside of the main body 231, the second insulating member 27 can play a certain role in insulating and isolating the main body 231 and the shell, thereby achieving insulation between the main body 231 and the shell. In addition, by extending the limiter 242 to the part between the main body 231 and the shell and arranging it between the second insulating member 27 and the main body 231, it is convenient to improve the structural stability between the limiter 242 and the main body 231, and it is convenient to assemble the electrode assembly 23 and the first insulating member 24 into the shell 21 of the shell at the same time, which is conducive to improving the assembly efficiency of the battery cell 20.

[0142] According to some embodiments of the present application, the present application further provides a battery 100 comprising a plurality of battery cells 20 according to any of the above schemes.

[0143] Among them, see Figure 2 As shown, the battery 100 may further include a case 10 , in which a plurality of battery cells 20 are accommodated.

[0144] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery 100 according to any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.

[0145] The power-consuming device may be any of the aforementioned devices or systems using the battery 100 .

[0146] According to some embodiments of the present application, see Figures 3 to 9As shown, the present application provides a battery cell 20, which includes a shell 21, an end cover 22, an electrode assembly 23, and a first insulating member 24. The shell 21 has an opening 211, and the end cover 22 covers the opening 211, and two electrode terminals 25 are arranged on the end cover 22. The electrode assembly 23 is accommodated in the shell 21, and the electrode assembly 23 includes a main body 231 and two pole ears 232 protruding at one end of the main body 231 along the thickness direction X of the wall, and the two pole ears 232 are respectively connected to the two electrode terminals 25. The first insulating member 24 is accommodated in the shell 21, and the first insulating member 24 includes an insulating body 241 and two limiting parts 242. Along the thickness direction X of the wall, the insulating body 241 is arranged between the end cover 22 and the electrode assembly 23 to insulate and isolate the end cover 22 and the electrode assembly 23. The insulating body 241 has a first abutting surface 2412 abutting against the main body 231 on the side away from the end cover 22 in the thickness direction X of the wall, and the first abutting surface 2412 is provided with a receiving groove 2413 for receiving the pole ear 232. Two limiting portions 242 are both convexly arranged on the first abutting surface 2412. Along the first direction Y, the two limiting portions 242 are respectively located on both sides of the main body 231, and at least part of the limiting portions 242 extends between the main body 231 and the shell 21 along the thickness direction X of the wall. The first direction Y is perpendicular to the thickness direction X of the wall. Among them, along the first direction Y, the main body 231 has an end face 2311, and the limiting portion 242 has a second abutting surface 2421 that fits with at least part of the end face 2311. The second abutting surface 2421 abuts against the end face 2311, and the end face 2311 and the second abutting surface 2421 are both arc surfaces.

[0147] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0148] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having a wall portion; An electrode assembly is contained in the housing, the electrode assembly comprising a main body and a tab, wherein the tab is protruding from one end of the main body along the thickness direction of the wall; as well as A first insulating member is accommodated in the shell, and the first insulating member includes an insulating body and a limiting portion. Along the thickness direction of the wall portion, the insulating body is arranged between the wall portion and the electrode assembly to insulate and isolate the wall portion and the electrode assembly. The limiting portion is connected to the insulating body. Along a first direction, at least a part of the limiting portion is located between the main body and the shell, and the first direction is perpendicular to the thickness direction of the wall portion.

2. The battery cell according to claim 1, characterized in that: The housing comprises: a housing having an opening; An end cover, covering the opening, the end cover is provided with an electrode terminal, and the electrode terminal is electrically connected to the electrode tab; Wherein, the wall portion is the end cover.

3. The battery cell according to claim 1 or 2, characterized in that: Along the thickness direction of the wall, the side of the insulating body away from the wall has a first abutting surface that abuts against at least part of the main body, and the limiting portion extends from the first abutting surface away from the wall to between the main body and the shell.

4. The battery cell according to claim 3, characterized in that: The first abutting surface is provided with an accommodating groove for accommodating the pole lug.

5. The battery cell according to claim 1, characterized in that: The battery cell has a square structure, and the first direction is a length direction of the wall portion.

6. The battery cell according to claim 5, characterized in that: The first insulating member comprises: The two limiting portions are respectively located on two sides of the main body along the first direction.

7. The battery cell according to claim 1, characterized in that: Along the first direction, the limiting portion abuts against the main body.

8. The battery cell according to claim 7, characterized in that: Along the first direction, the main body has an end surface, the limiting portion has a second abutting surface that fits at least partially with the end surface, and the second abutting surface abuts against the end surface.

9. The battery cell according to claim 8, characterized in that: The end surface and the second abutting surface are both arc surfaces, and along the first direction, the limiting portion is entirely located between the housing and the end surface.

10. The battery cell according to claim 8, characterized in that: The battery cell comprises a plurality of electrode assemblies, the plurality of electrode assemblies are stacked along a second direction, and the first direction, the second direction and the thickness direction of the wall portion are perpendicular to each other; The limiting portion has a plurality of second abutting surfaces arranged along the second direction, and each of the second abutting surfaces abuts against the end surface of one of the main bodies.

11. The battery cell according to claim 1, characterized in that: Along the thickness direction of the wall portion, the length of the portion of the limiting portion extending between the main body portion and the shell is L1, and the length of the main body portion is L2, satisfying that L1≥0.05×L2.

12. The battery cell according to claim 1, characterized in that: Along the first direction, the maximum thickness of the limiting portion is D1, satisfying D1≤50 mm.

13. The battery cell according to claim 1, characterized in that: Along the first direction, the minimum thickness of the limiting portion is D2, satisfying 0.05 mm ≤ D2 ≤ 2 mm.

14. The battery cell according to claim 1, characterized in that: Along the first direction, the minimum distance between the main body and the shell is D3, and the minimum thickness of the limiting portion is D2, satisfying 0.05×D3≤D2≤0.95×D3.

15. The battery cell according to claim 1, characterized in that: The battery cell further comprises: A second insulating member, covering the outer side of the main body to insulate and isolate the main body from the shell; Wherein, along the first direction, a portion of the limiting portion located between the main body and the shell is arranged between the second insulating member and the main body.

16. A battery, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 15.

17. An electrical device, characterized in that: Comprising a battery according to claim 16.

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